According to Us Weekly, it was fear that her husband Eddie Cibrian was cheating on her that led Rimes to admit herself into a 30-day inpatient treatment facility for anxiety on August 30.

“LeAnn has had major insecurity issues since she first got together with Eddie,” a “friend of the couple” spilled to Us. “She’s been stressed about always being called a home-wrecker and also worried that Eddie is cheating on her. She’s been on a downward spiral.”

And judging from his past with Rimes – the couple hooked up on the set of their 2009 TV movie Northern Lights, they were both married at the time – the 30-year-old may have a point. And she’s got a surprising supporter in Real Housewives of Beverly Hills star Brandi Glanville – the woman Cibrian was married to and shared two sons (Mason, 9, and Jake, 5) with when he and Rimes began seeing each other.

“I totally support LeAnn’s decision to enter rehab — my top priority is my children, and at the end of the day we are a family,” Glanville told Us. ”LeAnn is their stepmom, and they love her. I am wishing her all the best and I hope she will find what she is looking for while in rehab.”